Regner in green. philip madsen wrote: They are mathematical/physical tools, but they are profusely real! They describe your reference points in the real world when you do measurements/observations of that real world. Two different perspectives are just two different ways of seeing the same one truth. I don't understand how you can have a problem with that. If I was sitting still in a train traveling at 180 km/h - then I would be both sitting still, and traveling at 180km/h towards my destination (assuming I boarded the right train) - for those in the US; such trains are actually common and useful in the rest of the world... So if I look at your front and another person looks at your back, we are both suffering an illusion - what are we supposed to see? That you have a front- and a back-side are both part of the same reality, as is the fact that we can only see one side at a time. A Helio-centric and a Geo-centric Solar system are two very different situations that cannot be part of the same reality. Seeing the Sun, Moon, etc., set and rise from our perspective on Earth, is expected in one scenario and not excluded in the other. But one is wrong and which one, has to be established by other means. - Regner
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